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Polyester film stock may not be immortal .

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  • Polyester film stock may not be immortal .

    I have just read an interesting article in the latest issue of Film Collector # 42 magazine published by Classic Home Cinema here in the UK .
    The article is titled :- POLYESTER IN DETONATION : THE MYTH OF IMMORTALITY BEGINS TO CRACK and it is printed on pages 20 - 21 and has been written by Ignacio Benedeti .

    In this article Ignacio has discovered during inspection of a 35mm trailer from 2008 , that even when carefully stored and free from temperature swings , in an archive that never exceeds 21 degrees Centigrade even in the height of summer , he came across something unthinkable . A clean break running across the frame from the centre outward . A fault line had opened up in the very core of the base . As if something had detonated within the polyester , slicing it cleanly from within in a way no external handling could have caused . It was not an isolated case because after checking other 35mm polyester trailers from between 2004 and 2014 he found similar internal crystallizations every few meters . Not an all reels but on enough to raise an archivist's blood pressure .
    There is much more valid detail printed in this article including input from archivist Jack Theakston , German archivist Peter Willems and a response from Kodak as to it's possible causes . There is also a colour photo of the photo example of this problem on 35mm stock .
    The article concludes with a provisional that although deeply troubling Polyester film stock is not immortal after all if it rushed through production and subjected to mechanical abuse . Something i have stated in the past to others and suspected all along .

  • #2
    Hello David,

    Very interesting. For those of us who do not get Film Collector magazine due to being in the US, do you think you can scan the two pages and upload them here so we can read the article?

    Thanks Ken

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    • #3
      It's funny when you think about it. The industry starts off using a substance that can self combust and should be clearly kept away from any heat source or naked flame. Just perfect to stick in front of a focused carbon arc. And ends up with a material that arrives to the factory as granules, and then leaves the world as a pile of dust on the projection room floor.

      Only looking back now, it was clear the writing was on the wall in those last few years of film, that this was just a cheap fix to save money before digital. First you had the change over to cyan soundtracks which meant silver was no longer required. And then polyester, that has a shelflife roughly the same as Eastmancolor, never meant to last. As long as the print could see it's way to the end of the run, that is all that mattered.
      The problem with polycarbonates is that they will eventually return back to their original compound of powder.
      Heaven forbid you had to show a print for more than four weeks. Lost the soundtrack completely off of the prints of Titanic and Chicago, they literally decomposed due to use.
      At the end of the day it was all down to money. It was cheaper to produce polyester over acetate, and with digital on it's way they knew that they would not have to archive film prints in the future. The problem is then Kodak went over to producing polyester for the industry, that was it for every film gauge no more acetate.
      Take it or leave it.

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      • #4
        It's a major lesson of life: nothing is permanent!
        There's a second major lesson that goes along with it: whatever it is, enjoy it while you can!

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        • #5
          It would be interesting if folks find the same issue in older polyester film stocks, and might this be a condition just on these newer years of polyester? I mean, I have polyester trailers going back over 60 years, and have never ran into that. Just a thought ... Could this be an attempt jointly by studios and film labs that are supported by them, of creating a short life span polyester that will automatically degrade quickly so that novice, non professional fans of cine, wouldn't be able to acquire prints, and the studios would have more control over they're product?

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          • #6
            Or maybe just cost cutting during production.

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            • #7
              This reminds me of the debacle with Divx years ago, but at least they were honest about it years ago. A Divx disc was supposed to only be playable ten times, but there were other studios who put out DVD's that would mysteriously,v without a single observable defect, stop playing, no matter what DVD device was used. I actually admire the tactic, however, if there is one with this modern polyester stock. It's hard enough alone to not only protect your copyrighted works, it's even harder to keep up with the bad actors that will put it out there for free on the Internet. Even though I love Cine as much as any of us, if changing the polyester stock will keep it from being out there, potentially being pirated, I am for it.

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              • #8
                Hello Ken .
                I do not want to scan that article as i do not want to do so without permission first as i may be in breach of copyright .
                However you can subscribe to Film Collector magazine even though you live in the USA as Phil Sheard of Classic Home Cinema does post worldwide .

                01472291934

                chcinema@aol.com

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                • #9
                  Is this post on the author's blog being the very same as the article in the magazine?

                  https://mimundoensuper-8.blogspot.co...th-of.html?m=0

                  Most of 35mm polyester prints in my collection are quite safe & sound. Minority of it might have slight stickiness issue (poly film stock seems to be quite sensitive to excess humidity) but not to the point of being unprojectable. I only had one sample of polyester with this extreme self-delamination damage. It literally cracked apart from the film base itself, just like in the article. However it's not the recent copy at the end of film era, but a badly faded Agfa film stock from mid 90's - the very peak of film distribution. So this might be not involved with cost-cutting measure as suspected.

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                  • #10
                    ​Nantawat Kittiwarakul ... Yes that is the same article .

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